JPH05264093A - Controlling method for operation of air conditioner - Google Patents

Abstract

PURPOSE:To prevent blown-up of warm-up air and to improve arrival of the warm-up air close to one's feet by reducing a frequency of a compressor to lower room heating capacity when a temperature in a room approaches a set temperature at the time of room heating of an air conditioner and simultaneously decreasing diffusing air flow rate to a room. CONSTITUTION:A method for controlling room heating of an air conditioner comprises the steps of (S1) first judging a difference Tn between a temperature in a room and a set temperature, (S3) judging a temperature Tr in a room in the case of 1>Tn>=0.5 ( deg.C), then (S4) operating at a first low air flow rate L at the time of Tr<23 ( deg.C), (S5) at a second low air flow rate 2L (<L) in the case of 23<=Tr<25 ( deg.C) or (S6) at a second low air flow rate 3L (<2L) in the case of Tr>=25 ( deg.C). A frequency of a compressor is reduced each time by a predetermined frequency to lower room heating capacity. Further, at the time of Tn<0.5 ( deg.C), it is lowered to an ultralow temperature 4L(<3L) (S8), and simultaneously the compressor frequency is reduced by an amount corresponding to a diffusing temperature. Thus, drafting feeling is alleviated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for an air conditioner.

[0002]

2. Description of the Related Art As a control method during heating operation in a heat pump system in which refrigerant discharged from a compressor is condensed in an indoor heat exchanger and evaporated in an outdoor heat exchanger,
The following two methods can be mentioned.

The first is a non-inverter machine, that is, an air conditioner which does not have an inverter and in which a compressor is driven at a constant frequency. As shown in FIG. 6, this is controlled so that the indoor temperature is maintained near the set temperature by repeatedly starting and stopping the compressor and the indoor fan. However, in this method, the frequency of starting and stopping is high and the temperature change in the room is large, so it cannot be said that the air conditioning comfort is excellent.

Therefore, in recent years, an inverter type air conditioner, that is, an air conditioner having a variable heating capacity by changing the compressor frequency has been put into practical use. As shown in FIG. 5, this is a control that reduces the heating capacity when the room temperature approaches the set temperature.

[0005]

Even in the above-mentioned inverter type control, as shown in FIG. 5, since the amount of air blown from the indoor fan is maintained constant regardless of the heating capacity, warm air easily rises. However, there may be a defect that warm air is hard to reach to the feet, or a defect that a draft feeling is generated. In particular, this tendency
It appears remarkably in a highly airtight and highly heat-insulated house, and therefore, there is a demand for an operation control method for an air conditioner that can provide sufficient air conditioning comfort even in such a house.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and an object thereof is to perform fine heating control so that the air conditioner can be further improved in air-conditioning comfort. It is to provide a driving control method of.

[0007]

Therefore, an operation control method for an air conditioner according to a first aspect of the present invention is directed to an inverter compressor, an indoor heat exchanger functioning as a condenser, and air heated by the indoor heat exchanger into the room. In the heating operation of the air conditioner provided with a blowing unit that blows air, when the room temperature _Tr approaches the set temperature, the compressor frequency and the amount of air blown into the room are reduced.

[0008] operation control method of an air conditioner according to claim 2, the airflow volume is smaller as the difference between T _h between the set temperature and the room temperature is reduced, also controlled to be smaller the higher the indoor temperature T _r It is characterized by being done.

Further, the operation control method of the air conditioner according to claim 3 is characterized in that the compressor frequency is controlled so as to decrease in a larger range as the blowout temperature DF increases.

[0010]

In the operation control method for the air conditioner according to the first aspect of the present invention, since the heating capacity is reduced and the amount of blown air is reduced at the same time, the warm air soaring is prevented and the warm air reaching performance to the feet is reached. And the draft feeling can be reduced.

Further, according to the operation control method of the air conditioner of the second and third aspects, it is possible to perform one-step and fine heating control.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the operation control method for an air conditioner according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a flowchart of an example of the operation control method. As shown in the figure, first, in step S1, the difference T _h between the set temperature and the room temperature is judged. If T _h ≧ 1 (° C.), the operation with the set air volume is continued in step S2. In addition, 1> T _h ≧ 0.
If the temperature is 5 (° C.), the indoor temperature T _r is determined in step S3. When T _r <23 (° C.), at the first low air volume L (step S4), 23 ≦ T
_In the case of _r <25 (° C), the second air volume lower than the above
Low air volume of 2 L (step S5) and T _r ≧ 25 (° C)
In this case, the operation is performed at the third low air volume 3L having a lower air volume (step S6), and the compressor frequency is set to a constant frequency (eg, 1 Hz / m) in step S7.
in. ) Gradually decrease. That is, 1> T _h ≧ 0.5
In the range of (° C.), the higher the indoor temperature _Tr , the smaller the set air volume is controlled.

When T _h <0.5 (° C.),
The set air volume is set to the lowest ultra-low air volume of 4 L (step S8), and control is performed to change the compressor frequency by an amount according to the blowout temperature (step S9). This control will be described below. First, as shown in FIG.
F is divided into a plurality of areas, and a coefficient α is set for each area. The coefficient α increases as the blowout temperature DF increases, such as -1, 0, 1, 2, 3. Then, during the process from step S8 to step S9, α at that time is determined by the algorithm shown in FIG. 3, and in step S9, (1 + α) H
z / min. The control is performed to lower the compressor frequency one by one. In other words, the higher the blowout temperature DF, the greater the reduction range of the compressor frequency. Note that FIG. 4 shows a time chart of the above control.

According to the control of the above-described embodiment, there are advantages that the indoor temperature is made uniform by reducing the warm air rise, the draft feeling is reduced, the noise is reduced by reducing the air volume, and the running cost during heating is reduced by reducing the compression function. ..

[0016]

According to the operation control method of the air conditioner of the above-mentioned claim 1, since the heating capacity is reduced and the amount of blown air is reduced at the same time, the warm air soaring is prevented to reach the feet. The warm air reaching performance can be improved and the draft feeling can be reduced. Therefore, fine heating control can be performed, and the comfort of using the air conditioning can be improved.

Further, according to the operation control method of the air conditioner of the second and third aspects, it is possible to perform one-step and fine heating control.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining an embodiment of an operation control method for an air conditioner of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between the outlet temperature and a coefficient α in the above.

FIG. 3 is a flowchart illustrating an algorithm for determining the coefficient.

FIG. 4 is a time chart diagram of control in the method of the embodiment.

FIG. 5 is a time chart diagram of a control method in a conventional inverter machine.

FIG. 6 is a time chart diagram of a control method in a conventional inverter machine.

[Explanation of symbols]

T _r Indoor temperature T _h Difference between set temperature and indoor temperature DF Blowout temperature

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[Procedure amendment]

[Submission date] December 18, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 1]

[Figure 3]

[Figure 5]

[Figure 4]

[Figure 6]

Claims (3)

[Claims] 1. An indoor temperature during a heating operation of an air conditioner equipped with an inverter compressor, an indoor heat exchanger functioning as a condenser, and a blowing means for blowing the air heated by the indoor heat exchanger into the room. When (T _r ) approaches a set temperature, the operation frequency of the air conditioner is reduced together with the compressor frequency. 2. The blowout air volume is controlled to be smaller as the difference (T _h ) between the set temperature and the room temperature is smaller, and is smaller as the room temperature (T _r ) is higher. Item 1. An air conditioner operation control method according to item 1. 3. The compressor frequency is a discharge temperature (DF).
The air conditioner operation control method according to claim 1 or 2, wherein the control is performed so as to decrease with a larger width.